WPSAR Vol 4, No 2, 2013 | doi: 10.5365/wpsar.2013.4.2.008 www.wpro.who.int/wpsar 1 a Division of Health Securities and Emergencies, World Health Organization Regional Offi ce for Western Pacifi c, Manila, Philippines. b World Health Organization, Geneva, Switzerland. c Emerging Diseases Surveillance and Response, World Health Organization, China Offi ce, Beijing, China. d Chinese Center for Disease Control and Prevention, Beijing, China. * Members of the World Health Organization Regional Offi ce for the Western Pacifi c Event Management Team: Nyka Alexander, Steve Bice, Joy Rivaca Caminade, Xavier Dufrenot, Emily Jane Fearnley, Alice Ruth Foxwell, Nori Isoda, Michelle McPherson, Zu Rongqiang, Tomoe Shimada. Submitted: 8 May 2013; Published: 21 May 2013 doi: 10.5365/wpsar.2013.4.2.008 On 31 March 2013, the National Health and Family Planning Commission, China notified the World Health Organization of three cases of human infection with avian influenza A(H7N9) from Shanghai and Anhui.1 By 8 May, 131 cases, including 26 deaths, had been notified from 11 provinces/ municipalities.1,2 The majority (81%) of reported cases were from Shanghai municipality and Zhejiang and Jiangsu provinces. Available data indicate that more than three quarters of cases (59/77, 76%) had recent exposure to animals. Among these, 58% (34/59) had direct contact with chickens and 64% (38/59) visited a live bird market (LBM).3 Provincial and national authorities in China have collected more than 80 000 samples from LBMs, poultry slaughter houses, poultry farms, wild bird habitats, pig slaughter houses and their environments. As of 7 May, 50 samples were positive for avian influenza A(H7N9): 39 samples from poultry from LBMs in Anhui, Jiangsu, Jiangxi, Guangdong, Shanghai and Zhejiang provinces (26 chickens, three ducks, four pigeons, six unknown) and 11 environmental samples from LBMs in Shanghai, Henan and Shandong provinces.4 None of the samples from poultry farms or pigs were positive.5
[1]
S. Vong,et al.
Human infections with avian influenza A(H7N9) virus in China: preliminary assessments of the age and sex distribution.
,
2013,
Western Pacific surveillance and response journal : WPSAR.
[2]
S Riley,et al.
A model to control the epidemic of H5N1 influenza at the source
,
2007,
BMC infectious diseases.
[3]
Y. Guan,et al.
Effect of interventions on influenza A (H9N2) isolation in Hong Kong's live poultry markets, 1999-2005.
,
2007,
Emerging infectious diseases.
[4]
R. Webster.
Wet markets—a continuing source of severe acute respiratory syndrome and influenza?
,
2004,
The Lancet.
[5]
Y. Guan,et al.
Avian Influenza in Hong Kong 1997–2002
,
2003,
Avian diseases.
[6]
Tian Bai,et al.
Preliminary Report: Epidemiology of the Avian Influenza A (H7N9) Outbreak in China
,
2013
.